ci: handle permission error

.github/workflows/deploy.yml

@@ -118,10 +118,6 @@ jobs:
             echo "*** pre commands ***"
             apt-get update && apt-get -y install jq
             echo "******"
-          postCommands: |
-            echo "*** post commands ***"
-            chmod 777 ./tf/vapid_jwk
-            echo "******"
         env:
           CLOUDFLARE_ACCOUNT_ID: ${{ secrets.CF_ACCOUNT_ID }}
         continue-on-error: true
@@ -129,6 +125,8 @@ jobs:
 
       - name: generate VAPID keys if needed
         run: |
+          sudo chmod 777 ./tf/vapid_jwk || true
+
           if [ ! -s ./tf/vapid_jwk ]
           then
             node ./scripts/generate-vapid-keys.mjs > ./tf/vapid_jwk